Version 0.13.0 Released

[SephiRok]

• NOTE: Previously saved games are not compatible with this version.
  
  * Added create new game panel for single player.
  * Added more alien species.
  * Added diplomacy options to gift or demand credits.
  * Added version check to saved games.
  * Added multiplayer version checks.
  * Implemented continue button.
  * Improved diplomacy.
  * Improved economy panel.
  * Improved military panel.
  * Improved save and load panels.
  * Improved stability.
  * AI now detects troop concentrations at their borders and asks for retreat.
  * Default texture quality is now medium.
  * Fixed crash when clicking the workshop button from the refit panel.
  * Fixed game browser panel refreshing.
  * Misc tweaks and fixes.